#include <fstream>
using namespace std;

bool litera(char &c)
{
     if((c>='a' && c<='z') || (c>='A' && c<='Z')) return true;
     return false;
}

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    int k,length=0,cuv=0;
    char c,ant='.';
    while(in.get(c))
    {
                  if(litera(c)) length++;
                  if(litera(c) && !litera(ant)) cuv++;
                  ant=c;
    }
    out<<length/cuv;
    return 0;
}